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authorJohn Garry <john.garry@huawei.com>2020-08-19 18:20:27 +0300
committerJens Axboe <axboe@kernel.dk>2020-09-04 00:20:47 +0300
commitf1b49fdc1c64db110aa1315831e5fe0f8599fa56 (patch)
tree3326f32212adf701cd0b0882f1e0193ac22dad1a /block/blk-mq.h
parentbccf5e26d99c28980bd6ced474422a1b18402263 (diff)
downloadlinux-f1b49fdc1c64db110aa1315831e5fe0f8599fa56.tar.xz
blk-mq: Record active_queues_shared_sbitmap per tag_set for when using shared sbitmap
For when using a shared sbitmap, no longer should the number of active request queues per hctx be relied on for when judging how to share the tag bitmap. Instead maintain the number of active request queues per tag_set, and make the judgement based on that. Originally-from: Kashyap Desai <kashyap.desai@broadcom.com> Signed-off-by: John Garry <john.garry@huawei.com> Tested-by: Don Brace<don.brace@microsemi.com> #SCSI resv cmds patches used Tested-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r--block/blk-mq.h16
1 files changed, 13 insertions, 3 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 25ec73078e95..a52703c98b77 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -292,8 +292,6 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
if (!hctx || !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
return true;
- if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
- return true;
/*
* Don't try dividing an ant
@@ -301,7 +299,19 @@ static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
if (bt->sb.depth == 1)
return true;
- users = atomic_read(&hctx->tags->active_queues);
+ if (blk_mq_is_sbitmap_shared(hctx->flags)) {
+ struct request_queue *q = hctx->queue;
+ struct blk_mq_tag_set *set = q->tag_set;
+
+ if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &q->queue_flags))
+ return true;
+ users = atomic_read(&set->active_queues_shared_sbitmap);
+ } else {
+ if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
+ return true;
+ users = atomic_read(&hctx->tags->active_queues);
+ }
+
if (!users)
return true;